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Make the SIMD tables correspond exactly to URI_MAP

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This commit is contained in:
Anthony Ramine
2021-03-26 09:36:12 +01:00
committed by Sean McArthur
parent b0ca489c20
commit 9643c936be
2 changed files with 24 additions and 6 deletions
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src/simd/avx2.rs
+7 -4
View File
@@ -37,11 +37,14 @@ unsafe fn match_url_char_32_avx(buf: &[u8]) -> usize {
let ptr = buf.as_ptr();
let LSH: __m256i = _mm256_set1_epi8(0x0f);
// See comment in sse42::match_url_char_16_sse.
let URI: __m256i = _mm256_setr_epi8(
0xb8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0x7c, 0x54, 0x7c, 0xd4, 0x7c,
0xb8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0x7c, 0x54, 0x7c, 0xd4, 0x7c,
0xf8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xf4, 0xfc, 0xf4, 0x7c,
0xf8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xf4, 0xfc, 0xf4, 0x7c,
);
let ARF: __m256i = _mm256_setr_epi8(
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
src/simd/sse42.rs
+17 -2
View File
@@ -24,9 +24,24 @@ unsafe fn match_url_char_16_sse(buf: &[u8]) -> usize {
let ptr = buf.as_ptr();
let LSH: __m128i = _mm_set1_epi8(0x0f);
// The first 0xf8 corresponds to the 8 first rows of the first column
// of URI_MAP in the crate's root, with the first row corresponding to bit 0
// and the 8th row corresponding to bit 7.
// The 8 first rows give 0 0 0 1 1 1 1 1, which is 0xf8 (with least
// significant digit on the left).
//
// Another example just to drive the point home: in column 15, '>' is
// rejected, so the values are 0 0 1 0 1 1 1 1, which gives us 0xf4.
//
// Thanks to Vlad Krasnov for explaining this stuff to us mere mortals in
// a GitHub comment!
//
// https://github.com/seanmonstar/httparse/pull/89#issuecomment-807039219
let URI: __m128i = _mm_setr_epi8(
0xb8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0x7c, 0x54, 0x7c, 0xd4, 0x7c,
0xf8, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc, 0xfc,
0xfc, 0xfc, 0xfc, 0xfc, 0xf4, 0xfc, 0xf4, 0x7c,
);
let ARF: __m128i = _mm_setr_epi8(
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,